A group of 36 students has an average present age of 14 years. When the age of the teacher is included, the average age rises by one. Calculate the teacher's age (in years).
Answer & explanation
Correct answer: option 4
ATQ,
Sum of ages of 36 students = 36 × 14 = 504
Average of the group including teacher = 15
Techer's age = (15 × 37) - 504
= 555 - 504
= 51 years